Tested it with an iPhone 4, worked with no problems. Everyone reading this, send an email to ford sync and tell them to fix the issue otherwise they will not know about it.

So Bluetooth works fine for your iPhone 4 but not 4S? I paired my friends 4S and it worked fine, but I didn't try it over several days.

You can try reverse pairing.

Or I'd delete all the phones, do a reset of MFT and a hard reset of the phone and do a clean pairing, or a clean reverse pairing. After your phonebook has transferred turn Off the auto phonebook download feature.

Your mobile phone may have Security Settings or an Auto Accept function that may interfere with pairing and connecting your mobile phone with SYNC. Check your mobile phone instructions to be sure the settings are not disabling your mobile phone's connection to SYNC.

Turn OFF Auto Phonebook Download

Try turning OFF the Auto Phonebook Download feature on SYNC. If this feature is ON, each time you connect your mobile phone with SYNC, the system searches for updates. Turning this feature OFF can help stabilize the connection with SYNC. You can choose to manually update your phonebook with SYNC through the Phone Menu.

Remove special ringtones and pictures

If you have problems calling or receiving calls from one or a few contacts, it may be due to a ringtone or picture that is associated with the contact. If this is the case, follow your mobile phone instructions for removing an associated ringtone or picture with that contact. Then try downloading your phonebook to SYNC, again.

Increase the volume

If the volume on SYNC is low when you are using your mobile phone, try turning up the volume on your mobile phone-while it is connected to SYNC. Many mobile phones have a dedicated volume control for Bluetooth-hands-free devices, which will also control the volume when it is connected to SYNC.

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